From the application results of CAE in the design of the third-generation synchrotron light source light blocking element, CAE is an indispensable and important tool, which can not only verify the rationality of the initial design model, but also optimize the design model through parameter adjustment. For complex working conditions and complex structures of light-blocking elements, full and effective use of mature CAE software for simulation analysis can greatly reduce design costs and shorten design cycles.
Switching on and off makes the light-blocking element subject to cyclic loading and unloading: when the temperature is increased during loading, the synchronous light irradiation area is under compressive stress; when unloading, the temperature is reduced and the irradiation area is under tensile stress. Therefore, the light blocking element is in an out-of-phase thermal fatigue state. At the same time, in a thermal load cycle, the light blocking heat usually takes a long time, and the material will produce high-temperature creep; while in the long run, each load cycle is variable in amplitude, and its cumulative damage effect must be studied in detail. Therefore, this kind of fatigue damage has special characteristics compared with the damage caused by ordinary mechanical loads, and its failure mechanism must be continuously deepened. Carry out the photothermal fatigue experiment of absorber and put forward a suitable fatigue life prediction model.
Experimental research is the most direct assessment of structural performance and can verify the results of numerical simulation and theoretical analysis. It is the starting point for designing new experiments to make full use of the experimental researches carried out by APS, ESRF and SPring-8, etc., to improve the existing problems and unreasonable factors to make the experiment more realistic and contain more influencing factors. The fatigue model is the core of the low-cycle fatigue design criteria. A suitable fatigue model is required to describe the failure mode of the component under thermal load and accurately predict the fatigue life.
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